Concentrated surround dual LEDs (light emitting diode) provide superior vial visibility. UV (ultra-violet) activated optical brightener maximizes LED light intensity. High contrast e-Band vials highlight the edge of the bubble. Reinforced vial locking system secures acrylic block vials and delivers long life accuracy by resisting breaking, leaking or fogging. IP54 rating protects level from dust and water. Tool-free removable, shock absorbing end caps provide superior protection and scribing performance. Precision milled edges for guaranteed accuracy. Surface grippers prevent the level from sliding on angled surfaces. Powerful rare earth magnets provide superior holding strength. LEDs flash when battery is low. Automatic shut-off saves battery life by turning off LEDs after two minutes. Hang hole for ease of storage. Includes (2) AA batteries.